We present 2 cases of Haemophilus influenzae meningitis. The first is a patient with atypical simptomatology: abdominal pain, fever and two days later pain in the back of his legs. Abdominal pathology was not found. The cerebrospinal fluid (CSF) showed polymorphonuclear cells, hyperproteinorachia and lowered glucose. CSF culture revealed Haemophilus influenzae, blood culture was sterile. The second had suffered surgery at maxilar and ethmoid sinuses four years before, and unknown germ meningitis 6 months before. Haemophilus influenzae was isolated from CSF cultures and CSF rhinorrhea was detected by isotopic cisternography.